What year was christmas declared a national holiday?

1870

Explanation:

From about 1840, celebrating Christmas became more widespread. December 25 was declared a federal holiday in the United States in 1870. Since then Christmas Day has become a steadily more important holiday.

theodore roosevelt challenged william to a duel, whoever won, got their policy sent to congress. it ended up in a stalemate, and both men were injured and sent to the hospital.

the cost of college has risen faster than inflation for many years.

the high price of student services and administration are two reasons for the rapid increase in cost.