In the early 20th century and late 1900s; A complicated piece of legislation, it essentially gave preference to immigrants from Central, Northern and Western Europe, severely limiting the numbers from Russia and Southern Europe, and declared all potential immigrants from Asia unworthy of entry into the United States.
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The Central Powers which included Germany,Austria-Hungary,Ottoman Empire and Bulgaria so A) because of the limited correct answers
A consumer is someone who purchased goods or services. So if people stop buying that certain good or service. Then the economy can go down because there won't be as much money coming in as there was. And then if people buy more of a certain good or service then the economy will go up because they'll be receiving more money.
I hope this helps.
Special words or expressions that are used by a particular profession and are difficult for others to understand are called "jargon," since they are often only understood by people "in the know".