What year did valentine's day become an official holiday?

What was the “u-2 incident” and how did it affect u. s./soviet relations in 1960?

Plz what action did president jefferson take to stop britain and france from seizing american merchant ships? a. he declared war on france. b. he called for increased tariffs on british and french goods. c. he called for an embargo on all foreign trade. d. he declared war on britain.

The constional convection created a house of representatives as part of the