What did roger b taney do that increased regional tensions in the united states during the 1850's

The correct answer to this open question is the following.

Roger B. Taney increased regional tensions in the United States during the 1850s because he was the judge that gave the decisive vote in the Supreme Court case Dred Scoot v. Sandford.

This happened on March 6, 1857. The Supreme Court decided that Dred Scott was not considered a person, but property. So he could not ask the Court for his liberty. Justices said that African Americans were not citizens under the Constitution of 1787. Justice Taney insisted that Scott was property and belonged to his owner. This decision enraged African Americans and abolitionists of the Northern states.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.