Which group of people could freely immigrate to United States under the immigration act of 1924?

An economic term that describes happiness and its hard to measure in numbers is

The provisions of subpart d, of the hhs regulations, additional protections for children involved as subjects in research apply to: all research involving childrenall research that is > minimal riskall research funded by any federal agencyall research funded by hhs

Who was thomas jefferson and what was his constitution toward the development of the us government