It can be inferred from the chart shown that
a. german immigration rates are twice that if italians.
b. chinese is decreasingly popular in the united states.
c. immigration in the united states has slowed significantly.
d. there is significant diversity in language usage in the united states.

`stare decisis is a legal doctrine that obligates courts to follow historical cases when making a ruling on a similar current or future case. stare decisis ensures that cases with identical facts be approached in the same way, unless overruled by the same court or a higher court such as the us supreme court. simply put, it binds courts to follow legal precedents set by previous decisions.

stare decisis is a latin term meaning "to stand by that which is decided".