Texas Senator Ted Cruz has announced he is a candidate for president.
Since the 1950s, American presidents have been going to Camp David in the mountains of Maryland, just outside Washington, D.C.
The United States Capitol Dome in Washington, DC, is recognized around the world as a symbol of the U.S. government.
Child abuse and child neglect are serious crimes. Some U.S. laws are designed to protect children from their very own parents.