Original--President by electoral college, Senators by state legislators, and House of Representatives by direct vote. Direct vote is by land-owning, white, males who were 21 or older.
President has remained the same.
Senators--changed to direct vote with the 17th Amendment in 1912
House of Representatives has remained the same.
Those who can vote has changed through time. In the 1820s and 1830s states removed the landowner condition for voting. In 1870, black men were given the right to vote under the 15th Amendment. In 1920, women were granted the right to vote under the 19th Amendment. Lastly, the age was moved from 21 to 18 in 1971 with the 26th Amendment.
I believe that some of the benefits are longer life span, the ability to harvest crops, and the ability to create a thriving community. I think these are good benefits because if you are living in a permanent settlement then you can grow your own crops meaning that you can live off of those crops and you dont have to go foraging for food (sometimes producing nothing). Also a good community is almost essential to living with a group of people beacause it enhances trade and communication with other communities as well. :)
