Answer:
2nd Coin goes under "this is an image of the ship used to navigate the Mississippi" because it looks like a ship.
3rd Coin goes under "Lewis and Clark encountered Bison on their trip" because there is a bison on the coin.
5th Coin goes under "This coin symbolizes the Louisiana Purchase" because there shaking hands on the coin.
1st Coin goes under "Thomas Jefferson was President at the time" because Thomas Jefferson is on the coin.
4th Coin goes under "This coin represents the Oregon coast where the trip ended because it looks like a coast.
6th Coin goes under "Name of the group assembled to explore the west"
Hope this helped. Also, try expanding the picture to see the coins better because I'm pretty sure there are words on the coins like "Louisiana Purchase" that tell you the answers.