Answer to 6) is a) 1941. Though Americans began to celebrate the 4th of July in 1776 as soon as our independence was announced, it took 175 years for Congress to make Independence Day a legal holiday for the entire nation. Thank you Congress!
7) What two U.S. presidents died on the same day?
a) James Madison and James Monroe
b) John Adams and Thomas Jefferson
c) Andrew Jackson and William Henry Harrison
d) Millard Fillmore and James Buchanan