Question

what law made it clear that people in the north free states were expected to cooperate if southern owners tried to reclaim a slave that had excepted in the north

Answer 1

Step-by-step explanation:

t required that all escaped slaves, upon capture, be returned to their masters and that officials and citizens of free states had to cooperate.

...

Fugitive Slave Act of 1850.

Citations

Public law Pub.L. 31–60

Statutes at Large 9 Stat. 462

Legislative history

Signed into law by President Millard Fillmore on September 18, 1850