
Barrios' War of Reunification was a war initiated by President Justo Rufino Barrios of Guatemala. His goal was to reunify Central America with himself as President. He died in battle on 2 April 1885 and peace was reached on 14 April.

The Dominican Civil War took place between April 24, 1965, and September 3, 1965, in Santo Domingo, Dominican Republic. It started when civilian and military supporters of former President Juan Bosch overthrew acting President Donald Reid Cabral. The coup prompted General Elías Wessin y Wessin to organize elements of the military loyal to President Reid ("loyalists"), initiating an armed campaign against the so-called constitutionalist rebels. Allegations of foreign support for the rebels led to a United States intervention in the conflict, which later transformed into an Organization of American States occupation of the country. Elections were held in 1966, in the aftermath of which Joaquín Balaguer was elected into the presidential seat. Later in the same year international troops departed from the country.

The Football War was a brief war fought between El Salvador and Honduras in 1969. Existing tensions between the two countries coincided with rioting during a 1970 FIFA World Cup qualifier. The war began on 14 July 1969, when the Salvadoran military launched an attack against Honduras. The Organization of American States (OAS) negotiated a cease-fire on the night of 18 July, which took full effect on 20 July. Salvadoran troops were withdrawn in early August.

The Iraq War was a protracted armed conflict that began in 2003 with the invasion of Iraq by a United States-led coalition that overthrew the government of Saddam Hussein. The conflict continued for much of the next decade as an insurgency emerged to oppose the occupying forces and the post-invasion Iraqi government. An estimated 151,000 to 1,033,000 Iraqis were killed in the first three to four years of conflict. US troops were officially withdrawn in 2011. However, following the spread of the Syrian Civil War and the territorial gains of the Islamic State of Iraq and the Levant (ISIL), the Obama administration decided to redeploy US forces to Iraq in 2014. Many former soldiers are employed by defense contractors and private military companies. The U.S. became re-involved in 2014 at the head of a new coalition; the insurgency and many dimensions of the civil armed conflict continue. The invasion occurred as part of the George W. Bush administration's War on Terror, following the September 11 attacks.

The Mexican Indian Wars were a series of conflicts fought between Spanish, and later Mexican, Guatemalan, Honduran, Salvadoran and Belizean forces against Amerindians in what is now called Mexico and surrounding areas such as Belize, Guatemala, Honduras, El Salvador and Southern/Western United States. The period begins with Spanish conquest of the Aztec Empire in 1519 and continued until the end of the Caste War of Yucatán in 1933.

The Spanish conquest of El Salvador was the campaign undertaken by the Spanish conquistadores against the Late Postclassic Mesoamerican polities in the territory that is now incorporated into the modern Central American nation of El Salvador. El Salvador is the smallest country in Central America, and is dominated by two mountain ranges running east–west. Its climate is tropical, and the year is divided into wet and dry seasons. Before the conquest the country formed a part of the Mesoamerican cultural region, and was inhabited by a number of indigenous peoples, including the Pipil, the Lenca, the Xinca, and Maya. Native weaponry consisted of spears, bows and arrows, and wooden swords with inset stone blades; they wore padded cotton armour.

The Totoposte Wars were three military conflicts fought in Central America between 1890 and 1906. The First Totoposte War occurred during the presidency of Manuel Lisandro Barillas Bercián in Guatemala, after the overthrow of Salvadoran President Francisco Menéndez by General Carlos Ezeta in El Salvador, which caused the exile of many Salvadorans who took refuge in Guatemala and who requested the help of President Barillas Bercián to stop the armies of Ezeta. The Second Totoposte War arose after the opposition of Guatemalan President Manuel Estrada Cabrera to the integration of Guatemala with the Greater Republic of Central America since Estrada Cabrera was more inclined to work with the government of the United States. The Third Totoposte War occurred in 1906 in similar conditions. In all three wars, the Guatemalan people mockingly referred to the war as the "Totoposte War" because it only served to consume large amounts of this corn-based food, without actually fighting.

World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all the great powers—forming two opposing military alliances: the Allies and the Axis. In a state of total war, directly involving more than 100 million people from more than 30 countries, the major participants threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. World War II was the deadliest conflict in human history, marked by 70 to 85 million fatalities. Tens of millions of people died due to genocides, premeditated death from starvation, massacres, and disease. Aircraft played a major role in the conflict, including in the use of strategic bombing of population centres, and the only uses of nuclear weapons in war.