How did Fighting at Lexington and Concord cause the American revaluation?

The Battles of Lexington and Concord on 19 April 1775, the famous 'shot heard 'round the world', marked the start of the American War of Independence (1775-83). Politically disastrous for the British, it persuaded many Americans to take up arms and support the cause of independence.

Explanation:

one of the negative side effects were the economic losses the events of september 11th caused. many, many people lost their jobs as a result of a downturn in the economy after the terrorist attacks.

this isn't a question and if you're going to list things be kind and use commas.