Explain the difference between an open frontier and a closed frontier

It is undeveloped region that is open to settlement; open border.It means the land or territory that forms the furthest extent of a country's settled or inhabited regions. Often frontiers. the limit of knowledge or the most advanced achievement in a particular field: the frontiers of physics.

In 1890, the Census Bureau broadcast the closure of the frontier, meaning that in the west there was no apparent tracts of land without settlers. This news was a distinguished event in American history; the frontier represented danger because of the Natives who lived in the region but also freedom and opportunity.

a) hostility to or prejudice against jews.

b) the holocaust, also referred to as the shoah, was a genocide during world war ii in which nazi germany, aided by its collaborators, systematically murdered approximately 6 million european jews             , around two-thirds of the jewish population of europe, between 1941 and 1945.

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