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

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 lawPub.L. 31–60

Statutes at Large9 Stat. 462

Legislative history

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

by 1880, germany had more rail lines than great britain and russia.

a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”