1) The effect that explorers had on North America was that without these explorers, like Christopher Columbus, then the "New World" would have never been to be. It would have never been colonized.
4) Hello there, if you fellows might not know, my name is Christopher Columbus and I need YOU to help fund my journey. I will be exploring the unknown, think about that! One of your own people, making history. So please, help me and get me a crew. Thank you.
~I hope I helped! If the speech didn't make sense, please PM me. Thx~