Which accurately describes historical events of the Qin Dynasty? a. The Qin Dynasty welcomed Marco Polo and encouraged trade with many European and Middle East nations.
b. The Qin Dynasty began building the Great Wall of China and left tombs filled with terracotta warriors.
c. The Qin Dynasty was the first Chinese dynasty to be documented in historical texts.
d. The Qin Dynasty invented the crossbow, clock, gunpowder, wheelbarrow, and porcelain.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

a

explanation:

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

sorry i tried to but i didn’t get it