A key point of the proposed that Congress have two chambers (i. e., a bicameral legislature) with representation in both chambers based on state population

Virginia plan

Explanation:

Bicameral Legislature as pointed by the Virginia plan is such that a lawmaking body be made up of two chambers or parts. The U.S. Congress is one of them (Senate and House of Representatives)

The Senate is the higher or upper chamber of the two law making bodies. It is here that bills are passed and they become law. The senate is made up of 2 representatives from each state.

The House of Representatives is the lower house.

They are basically also concerned with making laws but in most occassion, when they propose a bill, the senate will have to discuss it through before it can be a law governing the state.

in this part of the declaration it refers to the point when american people didn't recognize the british domain and   breaks the political bands with britain, they forced a respectful separation.

mankind was created and entitled equally with rights   which were life, freedom and the seeking for happiness.

answer; in the 1950s;