Question

What 2 important historical events happened in 1803?

Answer 1

January 30 – Monroe and Livingston sail for Paris to discuss, and possibly buy, New Orleans; they end completing the Louisiana Purchase.

February 24 – Marbury v. Madison: The Supreme Court of the United States establishes the principle of judicial review.

hope this helps

Answer 2

March 1 – Ohio is admitted as the 17th U.S. state, retroactive from August 7, 1953 (see History of Ohio).
April 30 – Louisiana Purchase is made by the United States from France.