Why has April 15 come to be know as tax day ?

To spread IRS workers' workload and aid taxpayers

Explanation:

When "Tax Day" was moved to April 15th in 1955, many changes were coming federally. Lawmakers at the time made a point to state that the change was meant to help taxpayers recover, and to aid the IRS by moving the deadline back further. Though, there is some speculation that another reason why it was changed was to let the government push back their own payment deadlines to earn more interest.

a.) d-day invasion of normandy.

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“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).