Hundred years ago, in the beginning of the 20th century the entire world population was less than 2 billion people.
Today, in 2017, the current world population has exceeded 7 billions (7,299,000,000).
The world’s population is growing by 200,000 people a day!, but death and birth rates have declined over the past several decades. (World Bank)
See some Demographic Data for the Countries and Regions of the World:
Top 25 countries by population
The most populated countries in the world.
Population Density
Countries with the highest population density.
The correct answer is : Senate.
The only institution with the power to put the official for such a vote is the House of Representatives (this is called impeachment), and the official is then tried by the Senate.
President Adams did have a successful career after his presidency, and I think it was even more successful than presidency. His retirement from office was quite productive, because after becoming the second President, he became the first Vice President of the United States.