What was the importance of stone, stick, and shell symbols in the maya empire?

These objects represent Mayan numerals. Just like Roman numerals, they are combined to symbolize a numeral and this enabled astronomers, scholars and architects to compute various equations yet it was also used by farmers and traders in their day to day transactions.

the answer is c. many americans held nativist or racist views

the second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.