One of the greatest breakthroughs for professional women came in 1973 when the field of banking opened up for them.
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Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Formerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
The Native American interpreter Sacajawea was a valuable member of the Lewis and dark expedition in 1805.
Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization.
Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.