April 30

Wednesday 30, 1947:

In Nevada, the Boulder Dam is officially renamed Hoover Dam again.

Friday 30, 1920:

Peru becomes a signatory to the Buenos Aires copyright treaty.

Saturday 30, 1803:

Louisiana Purchase: The United States purchases the Louisiana Territory from France for $15 million, more than doubling – overnight – the size of the young nation.

Sunday 30, 711:

Moorish troops led by Tariq ibn-Ziyad land at Gibraltar to begin their invasion of the Iberian Peninsula (Al-Andalus).

Tuesday 30, 30:

Suggested date of the crucifixion of Jesus