Think of it as a giant chain. You have the President at the top, then followed by the vice president, and so on to the bottom of the chain. if the first link of the chain is broken, then you replace it with the chain link below it. So, the Vice president would replace the President, the Speaker of the House of Representatives would replace the Vice President, and so on.
The wealthy Egyptians performed in death rituals it was easier for the rich to participate in the rituals
They were mainly agriculture based and slavery was free labor.
The political cicumstances around the latin revolutions against the European colonies reminded most American leaders of the American Revolution. As a result they supported these struggles.