What was the purpose of the selective service act?

The purpose of the Selective Service Act (1917) was to make sure that when the country goes to war, it has enough troops to win. The first Selective Service Act was enacted during the first world war. Its main purpose was to get men registered for the draft, which in turn forced men to go to war to meet troop demands.

the answer is 1.. i think

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.