Question

Name 3 important events that happened in the first 2 decades of the 1800s.

Answer 1

november 7 1811 the battle of Tippecanoe the troops led by William Henry Harrison defeated Tecumseh

Answer 2

John Chapman (a.k.a. Johnny Appleseed) begins handing out apple seeds and seedlings to Ohio settlers in 1800.The U.S.
Library of Congress is founded on April 24, 1800.
The United States and North African Berber Muslims fight the First Barbary War from 1801 to 1805 in an effort to halt Barbary pirates' attacks upon American merchant shipping.

I hope this helps.