Why did the French and Indian War start/happen (a good explanation please)

When France’s expansion into the Ohio River valley brought repeated conflict with the claims of the British colonies, a series of battles led to the official British declaration of war in 1756.

Explanation:

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the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

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