Epidemiologic Reviews, 20(1): 71-80. Data collection is the process of gathering and measuring information on variables of interest, in an established systematic fashion that enables one to answer stated research questions, test hypotheses, and evaluate outcomes.pidemiologic Reviews, 20(1): 71-80. Data collection is the process of gathering and measuring information on variables of interest, in an established systematic fashion that enables one to answer stated research questions, test hypotheses, and evaluate outcomes.
It succeeded the First Continental Congress, which met between September 5, 1774 and October 26, 1774, also in Philadelphia. The second Congress managed the colonial war effort, and moved incrementally towards independence, adopting the United States Declaration of Independence on July 4, 1776.
The first ever Independence Day celebration took place in 1777 in Bristol, Rhode Island and Philadelphia. The celebration in Bristol consisted of a 13-gun salute in the morning and another at night.