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Nowadays, if you want to cross just about any major American river, all you need to do is find the bridge. But in 1776, as our American colonists geared up for full-scale war, it was not that easy! In fact, some of the most spectacular moments of the war involved sneaky water crossings, whether on the Hudson River, where soldiers strung a huge chain near what is now West Point, or the Delaware River, where Washington made his famous crossing.
So this Fourth of July, try this fun, history-inspired maths and logic puzzle for your kids to play to celebrate the holiday and our country's history.