In the 1960s and 1970s, the U.S. witnessed a rise of public interest groups, due to the progressive spirit of the time where a good number of them established their offices after 1960 and opened their doors after 1970s. The interest groups comprised of: professional associations, public interest groups, business and agricultural groups, labor groups, ideological groups, and public-sector groups. Several factors determined the growth interest groups in the United States. First, The U.S. is heterogeneous in several aspects: its geography, climate, economic potential, culture, ethnicity, and religions. The heterogeneity resulted in political, socio-economic and cultural divisions which led to the evolution of several interest groups, each with unique objectives.
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The people in ancient times travel from place to place in search of food and shelter before the cultivation of agriculture and settled life man was depended on wild animals and fruits for food so they used to travelle from one place to onother , besides in safe from harsh climate he used to travelle from one place to onother place
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truman doctrine is the principle that the US should give support to countries or people's threatened by Soviet forces or Communist insurrection. The invasion of South Korea made Truman genuinely fearful that the Soviet union and China intended to expand the sphere of communism throughout Asia.
A state of political and milatary tension after world war 2 between powers in the western Bloc