Why/how does trade make people and countries better off?

What was the main objective of the national origins act of 1924

What practical concern lay behind the promotion of longitudinally planned churches in 17th-century rome? a) allowing the circulation of pilgrimsb) interior lighting of the navec) support for the heavy domed) accommodating parishioners

Although male citizens have tp enroll in the selective service,the draft has not been used since 1973