Answer:
The first agreements, known as SALT I and SALT II, were signed by the United States and the Union of Soviet Socialist Republics in 1972 and 1979, respectively, and were intended to restrain the arms race in strategic (long-range or intercontinental) ballistic missiles armed with nuclear weapons.
Explanation:
International slave trade was not banned until 1808
Explanation:
African Captives who arrives as slaves to Jamestown in the early sixteenth century and after which slave labor was prevalent continuously until the American Revolution. During the declaration independence around four million captives were bought as slaves by Americans.
Slave trade was not a significant factor in the economy of union states, they fought for the abolition of slavery. By 1808, a ban on international slave trade was ruled. But the slave trade within the southern states could not be abolished.
Long before europeans has devised a leap day, mayans knew that a year on earth was longer than 365 days.
the mayans knew about the sun because they're considered one of the most advanced tribe back then. Their culture studied the sun a lot, including the seasons that may have passed during the rise and fall of the sun
Calendar. i hope this helps :)