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In addition to those of Groups 1A and 2A, three common elements that form only one ion each are
Tariffs
Taxes imposed by a government on imported goods, often used to protect domestic industries or retaliate in trade disputes.
Axis Alliance
A military and political alliance formed during World War II between Germany, Italy, and Japan, which opposed the Allied Powers.
World War II
A global conflict lasting from 1939 to 1945, involving most of the world's nations, and marked by significant historical events such as the Holocaust and the use of atomic bombs.
American Security
Measures and policies designed to protect the United States from internal and external threats, including military defense, border control, and cyber security.
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