Er ... you put the URL in your question. Why are you here at WikiAnswers instead of at the website you are asking about?
Looks like it's here - but it's not a help website that I can see. Just a place for teachers and students to post assignments.
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History TimelinesThe History PlaceHistory HelpHere's the link back to the main help page:What is the best homework help website?
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Click the link below for a huge list!
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Wolfram Alpha - see related link.
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Click the link below for many choices!
Click the link below for lots of choices!