Why did Congress decide who would be president and who will be vice president in the election of 1800?

In the election of 1800, a tie between Thomas Jefferson and Aaron Burr in the Electoral College led to a deadlock, as both received the same number of electoral votes. The Constitution mandated that the House of Representatives must choose the president in such cases. This situation highlighted flaws in the electoral process, ultimately leading to the 12th Amendment, which established separate ballots for president and vice president to prevent future ties.