Formerly , in the United States, many nurses worked as private duty nurses rather than in hospitals.
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By the nineteenth century, embroidery on men's clothing had virtually disappeared except for the occasional decorative vest and tie.
Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.