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The Cadore Letter was a message France sent to the United States Minister to France, John Armstrong. It implied France was willing to drop economic sanctions against the U.S. President James Madison responded with economic sanctions against Great Britain, increasing tensions that eventually led to the War of 1812.

General John Cadwalader commanded Pennsylvania troops during the American Revolutionary War. He participated in several key battles, won the trust of General George Washington, and participated in a duel with General Thomas Conway after Conway conspired to have Washington removed as Commander-in-Chief of the Continental Army.

John Caldwell Calhoun was a staunch defender of slavery, States' Rights, and Nullification. He served the nation as a Congressional Representative and Senator from South Carolina, U.S. Secretary of War and Secretary of State, and Vice President of the United States during the Antebellum Era. Calhoun’s policies inspired the Southern Secession Movement, which triggered the Civil War.

The California Gold Rush was the mass migration of Americans and others to California in search of gold, which was discovered at Sutter’s Mill in 1848. It led to California's statehood and is one of the most important events tied to America’s Manifest Destiny and how it shaped the United States.

The California Trail was used by more than 250,000 people to emigrate from the east coast to the American West in the 19th Century. The trail helped the United States settle the continent, from the East Coast to the West Coast.

The Camden Expedition was a Union advance into southwestern Arkansas that was part of the Red River Campaign (March 10–May 22, 1864). The expedition was a failure, leaving Confederate forces in control of the area. Following some of the battles, black Union soldiers and pro-Union Southerners were massacred by Confederates. In the wake of these atrocities, black troops rallied around the slogan “Remember Poison Springs!”

The Battle of Camden was fought between the United States of America and Great Britain on August 16, 1780, during the American Revolutionary War. American forces were led by General Horatio Gates, who made critical tactical errors that led to the near destruction of his army. With the victory, British forces expanded their control of the Southern Colonies and threatened to invade North Carolina. The defeat effectively ended Gates’ military career, less than three years after he led American forces to victory at Saratoga.

The Battle of Camp Allegheny — also known as the Battle of Allegheny Mountain — was fought between the United States of America and the Confederate States of America on December 13, 1861, during the Civil War. The outcome of the battle was a Confederate victory. The battle is most well-known for being part of the Western Virginia Campaign.

Camp Followers were civilians who traveled with and supported armies during the Colonial Wars and the American Revolutionary War.

Robert Campbell was an Irish-born Frontiersman, fur trader, and businessman. He is most famous for the years he spent trapping and exploring the American West and for various successful business ventures.

The Battle of Campbell’s Station was fought on November 16, 1863, during the Knoxville Campaign. Confederate General James Longstreet tried to cut off General Ambrose Burnside’s retreat to Knoxville, but Union troops reached a critical crossroads first. Although Confederate attacks pushed Burnside’s forces back, the Union army withdrew in good order and reached its fortifications at Knoxville.

The Canary Islands are a group of islands off the northwest coast of Africa that played an important role during the Age of Exploration. These islands were the first to be colonized by Europeans, and later became a stop for ships sailing to the New World.

Edward Richard Spring Canby was a career officer in the United States Army. Canby commanded the victorious Union troops during the Battle of Fort Blakely, which is often cited as the last major infantry engagement east of the Mississippi River during the American Civil War. He is likely most famous for his untimely death at the hands of Captain Jack, a Modoc chief, during peace negotiations.

The Battle of Carey’s Fort was fought between the United States of America and Great Britain on August 15, 1780, during the American Revolutionary War. American forces won the battle, which is most famous for being part of Thomas Sumter’s campaign against British outposts in South Carolina.

Guy Carleton was a prominent British officer and politician during the 18th Century. He is most famous in America for being the Governor of Quebec during the American Revolutionary War and commanding British forces during the Invasion of Canada (1775–1776).

John Carlyle was a prominent Virginia merchant and member of the Ohio Company.

The Battle of Carnifex Ferry was fought between the United States of America and the Confederate States of America on September 10, 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 Carolinas Campaign was a Union military campaign led by General William T. Sherman from February to April 1865, in North Carolina and South Carolina. Sherman marched north from Savannah with nearly 60,000 soldiers, occupied Columbia and Raleigh, and joined forces with General John Schofield and the Army of Ohio. The campaign ended when General Joseph E. Johnston surrendered Confederate forces in the Carolinas, Georgia, and Florida at Bennett Place.