What were Thomas Jefferson’s concerns with the Louisiana Purchase? A. He feared the nation was growing too large to govern  
B. He feared the debate between slave and free states  
C. He worried he had paid too much  
D. He worried that he had overstepped the Constitution

A. he feared the nation was growing too large to govern

Explanation:

" He was concerned that the Constitution did not address the liberties that were protected by the Bill of Rights." (Thoughts co)

"the Constitution did not specifically grant the federal government the authority to acquire more territory..." (National archives)

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.