1. 1836: The Battle of the Alamo begins in San Antonio, Texas, between the Texan rebels and Mexican forces during the Texas Revolution.

2. 1903: Cuba leases Guantanamo Bay to the United States “in perpetuity.”

3. 1991: Gulf War: Ground troops cross the Saudi Arabian border and enter Iraq, marking the beginning of the ground phase of the operation to drive Iraqi forces out of Kuwait.

4. 1997: Scottish scientist Ian Wilmut and colleagues announce the birth of Dolly the sheep, the first mammal cloned from an adult somatic cell.

5. 2005: The controversial Kyoto Protocol, an international treaty aimed at reducing greenhouse gas emissions, enters into force.