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The Mexican-American War was caused by several incidents that took place between the United States and Mexico, including the Texas Revolution, the Annexation of Texas, and a dispute over the border between Mexico and Texas. Further, instability in the Mexican Government and America's desire to fulfill its "Manifest Destiny" helped cause the war.

Lasting from April 25, 1846 – February 2, 1848, the Mexican-American War polarized sectional differences over the extension of slavery in the United States, and it served as a training ground for numerous general officers who fought on both sides during the American Civil War.

The Middle Colonies in the Colonial Era were New York, New Jersey, Pennsylvania, and Delaware. Known as the “Breadbasket Colonies,” they were diverse in terms of government, culture, and society but had similar economies. Although they supported the ideals of the American Revolution, they were reluctant to support independence. However, they were four of the 13 Original Colonies that declared independence from Britain in July 1776, creating the United States of America.

Visit Middle Creek National Battlefield, where the Battle of Middle Creek took place on January 10, 1862, during the Civil War, and ended in a Union Victory.

Key facts about the Battle of Middle Creek, also known as the Battle of Big Sandy River.

The Battle of Middle Creek took place on January 10, 1862. Union forces led by future President, James A. Garfield, won the battle. The victory helped open the way for a Union offensive into Middle Tennessee.

Educational videos that explain the events and importance of the Battle of Middle Creek, which took place on January 10, 1862, during the Civil War, and ended in a Union Victory.

The Battle of Middle Fork Bridge was fought between the United States of America and the Confederate States of America from July 6 to July 7, 1861, during the Civil War. The outcome of the battle was a Union victory. The battle is most well-known for being part of the Western Virginia Campaign.

The Middle Passage was a route in the Triangular Trade System that started in Northwest Africa, crossed the Atlantic Ocean, and ended in the Americas. The Middle Passage is most well-known for its use in the Transatlantic Slave Trade and the terrible suffering it imposed on imprisoned Africans who were sold into slavery.

The Battle of Middleburg was fought from June 17–19, 1863, during the Gettysburg Campaign. Union cavalry under Colonel Alfred Duffié and General David McMurtrie Gregg fought Confederate cavalry commanded by General J.E.B. Stuart for control of Middleburg and the roads leading through the Blue Ridge Mountains. Although Union forces regained Middleburg, Stuart withdrew toward Upperville and continued to prevent the Federals from gathering information about General Robert E. Lee’s movements.

Arthur Middleton was a South Carolina politician who rose to prominence during the American Revolution and signed the Declaration of Independence, making him a Founding Father.

The Judiciary Act of 1801 was signed into law by President John Adams on February 13, 1801. It expanded the Federal Court system, allowing him to appoint political allies to new positions. The appointments are known as the “Midnight Judges” and were quickly repealed by Thomas Jefferson.

General Thomas Mifflin was an officer in the Continental Army during the American Revolutionary War. He fought in several key battles during the war, and also served as a member of the Continental Congress as a delegate from Pennsylvania. Although he was involved in a plot to remove George Washington as Commander-in-Chief, he participated in the Constitutional Convention and signed the document, and is a Founding Father.

The Milan Decree, issued by Napoleon Bonaparte in 1807, was a key policy of the Continental System. This Decree required the seizure of ships from nations that complied with British shipping laws, including American ships. It increased tensions that eventually led to the War of 1812.

The Militia Act of 1862 boosted the size of the Union's armed forces by authorizing the enlistment of African-Americans and by empowering the president to order governors to draft citizens into state militias to meet federal manpower quotas.

Key facts about the Militia Act of 1862.

Key facts about the Battle of Mill Springs, also known as the Battle of Fishing Creek and the Battle of Logan's Crossroads.

The Battle of Mill Springs took place on January 19, 1862, the Battle of Mill Springs. It was the first major Union victory of the American Civil War and helped open the way for a Union offensive into Middle Tennessee.

The Battle of Milliken’s Bend was fought on June 7, 1863, during the Vicksburg Campaign. Confederate troops attacked a Union supply depot defended largely by newly recruited black soldiers, many of whom had formerly been enslaved. The Union defenders held their position with support from the gunboats Choctaw and Lexington, forcing the Confederates to withdraw. The courage of the African American soldiers helped change attitudes about them serving in the Union Army.

Key facts about the Battle of Mine Creek, the largest Civil War conflict fought in Kansas, and one of the larger cavalry engagements of the war.