Conflicts between countries have been some of the deadliest affairs in human history. An estimated sixty million people—3 percent of the world’s population—died during World War II.

But since World War II ended in 1945, interstate wars have become increasingly rare. This trend, however, does not mean that we’re living in peaceful times. Conflicts within countries—intrastate conflicts—have become much more common. Many of the deadliest conflicts of the twenty-first century have occurred within the borders of a single country.

In today’s interconnected world, challenges within one country’s borders have ramifications for the entire globe. Terrorists can capitalize on instability created by conflict to plot attacks at home and in faraway cities. Infectious disease outbreaks in conflict zones can easily spread uncontrolled across borders. And millions of refugees fleeing violence can increase pressure on neighboring countries’ public services.

This lesson explores the types, causes, and consequences of intrastate conflict and dives into the policies countries can implement to address these issues.

What is intrastate conflict?

Civil war is the clearest case of intrastate conflict, and it generally takes two forms.

Wars of secession occur when people fight to form an independent country. One example is the American Civil War, in which southern, slaveholding states attempted to break away from the United States and form a new country—the Confederate States of America—where slavery would remain legal.

Wars of succession, in which people fight to overthrow ruling authorities, are the second type of civil war. Arab Spring uprisings in Libya, Syria, and Yemen—during which anti-government protesters fought to oust oppressive political leaders—devolved into prolonged and violent wars of succession.

However, civil wars are just one type of intrastate conflict. Groups fight for many reasons besides seeking independence or a new government. Criminal organizations like drug cartels and terrorist groups like the Islamic State incite violence to control territory and people. Governments persecute minority groups to crush dissent or preserve social hierarchies; the United Nations accuses the Myanmar government of committing acts of genocide against a Muslim ethnic minority known as the Rohingya. And fighting erupts between citizens and governments over issues including corruption, lack of economic opportunity, and competing claims to territory and natural resources.

Types of Intrastate Conflict

Click on a type to learn more about it.

Weak, failing, or failed states—in which the government is unable to perform central functions like maintaining security or providing basic services such as electricity, health care, and education—are particularly vulnerable to conflict. In these countries, governments are often unable or unwilling to control what happens inside their borders, and this situation can allow terrorists and criminal groups to operate freely.

Intrastate conflict can also produce state failure by weakening a government’s control over its territory, as is the case in Somalia. Attacks by al-Shabab, a terrorist group, have left Somalia’s already fragile government unable to carry out crucial functions such as maintaining security and responding to natural disasters like a devastating drought in 2011. More than two million Somalis are internally displaced and face severe levels of hunger.

What are the global effects of intrastate conflict?

Although the most severe consequences of intrastate conflict are experienced where fighting takes place, some effects are far reaching.

Terrorists can capitalize on instability caused by intrastate conflict to train, prepare for, and carry out attacks. Between 2001 and 2017, 99 percent of all terrorism-related deaths occurred in countries that were embroiled in conflict or had high levels of political terror (which includes extrajudicial killings, torture, and imprisonment without trial). And though terrorism most often takes place in conflict-affected areas, terrorist groups can launch attacks in neighboring countries and faraway cities.

Additionally, intrastate conflict can weaken a country’s health system, impairing its ability to contain infectious disease outbreaks. Liberia and Sierra Leone struggled to control a 2014–16 Ebola outbreak in part due to poor health infrastructure, which conflicts from the prior decade had weakened. Public mistrust of health officials, after decades of unequal health-care access, further made it possible for Ebola to spread quickly across borders in West Africa and kill more than eleven thousand people.

Meanwhile, conflicts in Afghanistan, Syria, Venezuela, Yemen, and elsewhere have forced at least one hundred million people to flee their homes over the past decade. This mass displacement has led to refugees experiencing high rates of hunger, poverty, and sexual violence. Additionally, neighboring countries have faced challenges of suddenly accommodating thousands—if not millions—of new residents. Lebanon’s population increased by 25 percent after receiving Syrian refugees fleeing civil war. Even after the Lebanese government split its school days into two shifts to accommodate the new students, more than three hundred thousand Syrian refugee children remained unenrolled in 2014.

How can countries manage intrastate conflict?

Countries have various tools for responding to intrastate conflicts.

Governments can become more inclusive through free and fair elections, institute reforms to address underlying drivers of conflict, and pursue diplomacy or offer economic incentives to opposition groups.

Outside mediation can also prove productive when parties to an intrastate conflict have been unable to compromise. For example, foreign countries can try to bring the warring groups to diplomatic talks. This was the case in Northern Ireland in the 1990s after three decades of fighting between the region’s pro-British Protestants and pro-Irish Catholics. With the support of the British and Irish governments—and mediation by U.S. Senator George Mitchell—Northern Ireland’s opposing parties signed a peace deal called the Good Friday Agreement, and violence largely ended. 

Foreign countries can also use sanctions to incentivize one or both parties in intrastate conflicts to come to the negotiating table or implement reforms. This occurred in 1986 when the U.S. Congress passed the Comprehensive Anti-Apartheid Act, which imposed economic sanctions on South Africa for its violent discrimination against Black South Africans.

Additionally, foreign countries can intervene militarily to try to prevent further violence. The United Nations has the capacity to build and deploy its own multinational military force consisting of personnel, called peacekeepers, supplied by member countries. The United Nations has sent peacekeepers to conflict zones to protect vulnerable people, enforce cease-fires, and safeguard elections, among other missions. In 2019, more than one hundred thousand peacekeepers were active in fourteen countries, constituting the second-largest military force deployed abroad, trailing only that of the United States. 

Although these measures can alleviate some of the harm caused by intrastate conflict, they are not always enough to create peace. And in certain instances, outside interference—especially military intervention—can even exacerbate fighting, as was the case after the North Atlantic Treaty Organization intervened in Libya in 2011.

Ultimately, countries have a limited ability to respond to intrastate conflicts elsewhere because of sovereignty—the principle that countries have the authority to control what happens within their borders. However, some experts argue that a rethink of traditional understandings of sovereignty is required in an era in which one country’s domestic issues can trigger global consequences. According to this line of thinking, when countries fail to protect their citizens or do not meet their obligations to other countries to control infectious disease or prevent terrorism, these countries forfeit their right to sovereignty, and foreign countries can and should intervene.

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