C because Biden is democratic now
1700- the land was not very explored yet. There was a permanent mission in Baja California (today Mexico) but nothern California was claimed by Spanish, but not too explored yet.
1821- that's when Mexico had it, it's Mexico's independence year!
1846- In june and July- the California Republic!
1850- from September 9th it belonged to the States.
Answer: The answer is policy advisers.
Explanation:
When economist are trying to help improve the world, they are policy advisers.