The ______________ are things that will happen tomorrow.

We use a ______________ to show the days, weeks, months, and year.

Long ago, we fought _____________ to become a free country.

Look at the picture. The Aztec calendar was sometimes called the ________________.

What ocean did Christopher Columbus sail across more than 500 years ago?

This man led the first journey around the world.

Juan Rodriguez Cabrillo explored California in the area known as _____________.

One of the guides on the Lewis and Clark expedition was a Shoshone woman named __________.

Marco Polo explored _____________ with his uncle when he was only 17 years old.