Who was the first person to think of the idea of photography? aka who was the first person to think of getting permanent images by using chemicals and light?

How would you describe the state of germany between 1815 and 1848

Kublai khan honored his mongol heritage by: a)marring only one wife b)praying facing mecca five times a day c)slaughtering ten chinese officials every year d)building a large enclosed hunting ground at shangdu, his summer palace

Began during presidency of john q. adams tariff of 1828 and 1832 states’ rights versus federal authority john c. calhoun’s ‘proclamation to the people of south carolina’ concluded during the presidency of andrew jackson is which event are these characteristics describing