Which territory did the United States annex in 1898 that later became the 50th state?

Which state was the site of the British surrender at Yorktown in 1781? Which state was the site of the Confederate surrender at Appomattox Court House in 1865? Which state was the first to secede from the Union in 1860? Which city served as the capital of the Confederacy for most of the Civil War? Which state is home to the U.S. Military Academy at West Point? Which state is home to the U.S. Naval Academy? Which state is home to the U.S. Air Force Academy? Which state is home to Harvard University?