why did congress decide the election of 1800? select two.

Based on the outcome, it was mandated by the u.s constitution.
The popular vote was a tie.
no candidate won the electoral vote.
not enough citizens voted to determine the outcome.

Based on the given options, the two reasons why Congress decided the election of 1800 are:

1. The popular vote was a tie: The popular vote between candidates Thomas Jefferson and Aaron Burr resulted in a tie. As no candidate received a majority of the electoral votes, it fell upon Congress to determine the outcome of the election as stated in the Constitution.

2. No candidate won the electoral vote: In the election of 1800, both Thomas Jefferson and Aaron Burr received 73 electoral votes each, causing a deadlock. As a result, Congress had to intervene and determine who would become the President and Vice President.