<span>The laws passed by southern states to prevent african americans from owning land was the reconstruction acts of 1867. The Reconstruction Acts of 1867 laid out the process for readmitting Southern states into the Union.</span>
Well assuming you mean America, and not considering Civil War, I would say the draft of the Constitution Thomas Jefferson want to make slavery illegal, but he needed the southern states approval.
Sedimentary rocks form beneath the surface of the earth. 
Mummified fossils are commonly found in cold climates. 
<em>[ They are formed when remains are buried rapidly in dry cold or hot environments ]</em>