Kamikaze
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One reason factory owners employed children because they were significantly cheaper than hiring an adult. "the child is paired one shilling or one shilling and six pence". This shows that it's more cost efficient to hire a child.
Another reason factory owners employed children because of their size. Here is a quote to support this "The smallest child in the factories were scavengers they go under the machine". This shows that if the child is smaller they can do more dangerous jobs than an adult.
The event that convinced American leaders to call the grand convention was Shay's Rebellion. Shays' Rebellion constituted a wave of violent attacks on courthouses and other government properties in Massachusetts, initiating in 1786, which resulted in a full-blown military confrontation in 1787.
Not so sure about the shape . i do know however its a cold and a warm front spinning around and around maybe that might answer depending on the question