April 30: on this day in history

Historical events

1. 1803The United States completed the agreement to purchase the Louisiana territory from France; the country's area nearly doubled.
2. 1885The area around Niagara Falls in New York was protected as the first US state park.
3. 1897J. J. Thomson announced the discovery of the electron, the first particle smaller than an atom.
4. 1905Albert Einstein completed the doctoral thesis he would submit to the University of Zurich.
5. 1939NBC began regular television broadcasts alongside the opening of the New York World's Fair.

More days in April

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