The Boston Marathon is an annual marathon hosted by the U.S. city of Boston, Massachusetts, on Patriots' Day, the third Monday of April. Begun in 1897, inspired by the success of the first modern-day marathon competition in the 1896 Summer Olympics,^[1] the Boston Marathon is the world's oldest annual marathon, and ranks as one of the world's best-known road racing events. It is one of five World Marathon Majors.

Today, the Boston Athletic Association (B.A.A.) manages this event. Amateur and professional runners from all over the world compete in the Boston Marathon each year, braving the hilly New England terrain and varying weather to take part in the race.

The United States occupation of Veracruz, which began with the Battle of Veracruz, lasted for six months and was a response to the Tampico Affair of April 9, 1914. The incident came in the midst of poor diplomatic relations between Mexico and the United States, related to the ongoing Mexican Revolution.

After the Tampico Affair, where nine American sailors were arrested by the Mexican government for entering off-limit areas in Tampico, Tamaulipas,^[2]President Woodrow Wilson ordered the United States Navy to prepare for the occupation of the port of Veracruz. While waiting for authorization of Congress to carry out such action, Wilson was alerted of a delivery of weapons for Victoriano Huerta due to arrive to the port on April 21 on the German-registered cargo-steamer SS Ypiranga. As a result, Wilson issued an immediate order to seize the port's customs office and confiscate the weaponry. Huerta had taken power with the assistance of the American ambassador Henry Lane Wilson during a coup d'état in early 1913 known as La decena trágica. The Wilson administration's answer to this was to declare Huerta a usurper of the legitimate government, embargo arms shipments to Huerta, and support the Constitutional Army of Venustiano Carranza.

San Jacinto Day is the celebration of the Battle of San Jacinto on April 21, 1836. It was the final battle of the Texas Revolution where Texas won its independence from Mexico.

It is an official holiday in the State of Texas. An annual festival, which includes a reenactment, is held on the site of the battle. The Sabine Volunteers, a reenactment group from East Texas, participate in the San Jacinto Reenactment annually. This group is named for an actual militia group during the Texas Revolution. The reenactment group consists of four members and has appeared on the History Channel. A documentary entitled THE RE-ENACTORS OF SAN JACINTO directed by Emmy-winner Allen Morris, was released in 2010 and shown on HoustonPBS. The documentary details the annual San Jacinto Day celebration and shows the reenactment of the 18 minute battle.

Patriot's Day (officially Patriots' Day in Massachusetts^[1] and Patriot's Day in Maine^[2]) is a civic holiday commemorating the anniversary of the Battles of Lexington and Concord, the first battles of the American Revolutionary War. It is observed on the third Monday in April in Massachusetts^[3] and Maine^[4] (once part of Massachusetts), and is a public school observance day in Wisconsin.^[5] Observances and re-enactments of these first battles of the American Revolution occur annually at Lexington Green in Lexington, Massachusetts, (around 6:00 am) and The Old North Bridge in Concord, Massachusetts, (around 9:00 am). In the morning, mounted re-enactors with state police escorts retrace the rides of Paul Revere and William Dawes, calling out warnings the whole way.

Since 1969, the holiday has been observed on the third Monday in April, providing a three-day long weekend. Previously, it had been designated as April 19 in observance of the anniversary of the Battles of Lexington and Concord, the first battles of the American Revolutionary War. It is also a school holiday for many local colleges and universities, both public and private.