Effects that are dependent on the size of the population and regulate the growth of populations are called density-dependent effects.
The Senate has a number of powers which the House of Representatives (or any other institution) does not have.
These include:
- consenting to treaties (international agreements), which is a condition for their later ratification
- confirming appointments of a number of officials, such as the ambassadors, military officers, federal judges
-trying government officials if they were impeached by the House
If you mean ethnicity wise, African Americans (men only) received the right to vote in 1870. If you mean when did women get to vote, it was in 1920, August 26.
The leader of the majority party in the House of Commons is usually Britain's Prime Minister.
