what happened to this act during the 20th and 21st centuries?
Responding to the bombing of Pearl Harbor, Roosevelt used Alien Enemies Act to issue presidential proclamations 2525, 2526, and 2527, to apprehend, restrain, secure and remove Japanese, German, and Italian non-citizens.
Alien and Sedition Acts
On December 7, 1941, responding to the bombing of Pearl Harbor, President Franklin Delano Roosevelt used the authority of the revised Alien Enemies Act to issue presidential proclamations 2525 (Alien Enemies – Japanese), 2526 (Alien Enemies – German), and 2527 (Alien Enemies – Italian), to apprehend, restrain, secure and remove Japanese, German, and Italian non-citizens. 
what is report of 1800? Resolution arguing for the sovereignty of the individual states under the US Constitution and against the Alien and Sedition Acts. when was this acts created? 1798 what was the history behind it? The unrest sweeping Europe threatened to spread to the US, calls for secession started to rise, therefore, the acts were meant to guard against this perceived threat of anarchy.
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Alien and Sedition Acts [SEP] The Alien Enemies Act in the 20th and 21st centuries
The Alien Enemies Acts remained in effect at the outset of World War I and remains U.S. law today. It was recodified to be part of the US war and national defense statutes (50 USC 21–24). On December 7, 1941, responding to the bombing of Pearl Harbor, President Franklin Delano Roosevelt used the authority of the revised Alien Enemies Act to issue presidential proclamations 2525 (Alien Enemies – Japanese), 2526 (Alien Enemies – German), and 2527 (Alien Enemies – Italian), to apprehend, restrain, secure and remove Japanese, German, and Italian non-citizens. On February 19, 1942, citing authority of the wartime powers of the president and commander in chief, Roosevelt made Executive Order 9066, authorizing the Secretary of War to prescribe military areas and giving him authority that superseded the authority of other executives under Proclamations 2525–7.