Which action taken by president nixon increased opposition to the vietnam war in the united states?
a. bombing of cambodia
b. failing to use henry kissinger effectivelt
c. giving up south vietnam
d. increasing troop levels

a. Bombing of Cambodia

Details:

In 1969, President Nixon authorized bombing raids in Cambodia.  Then, beginning in April, 1970, Nixon ordered a ground attack on Vietcong bases in Cambodia.

Pres. Nixon believed attacking in Cambodia was necessary to forestall communist forces from attacking South Vietnam from that direction. But his decision was hugely unpopular with the American public, which did not want further escalation of the war.  This was seen as essentially an invasion of Cambodia by the US.   A key example of protests were those that occurred at Kent State University in Ohio, in May, 1970, in response to Nixon's Cambodia campaign.

u.s.a

china

india

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japan

answer:   migrations were important in the neolithic period. "two major migrations passing through southeastern europe were confirmed by the means of archaeo-genetic studies."

the first migration was the early neolithic period -- 6,000 before common era (bce) -- when the first farmers, from anatolia -- asia minor -- spread through europe. the second migration occurred during the early bronze age (3,000-2,500 bce) when the so-called "steppe population," from the eurasian steppe, replaced much of northern europe's previous population.

the first farmers of northern and western europe passed through southeastern europe with limited hunter-gatherer genetic admixture, which occurs when two or more previously isolated populations begin interbreeding. however, some groups that remained mixed extensively -- without the male-biased, hunter-gatherer admixture that prevailed later in the north and west, according to latest discoveries. southeastern europe continued to be a nexus between east and west, with intermittent genetic contact with the steppe people up to 2,000 years before the migrations that replaced much of northern europe's population.

"in some places, hunter-gatherers and incoming farmers seem to have mixed very quickly," says iain mathieson, a geneticist at the university of pennsylvania, who was first author of the paper. "but, mostly, the two groups remained isolated, at least for the first few hundred years. these hunter-gatherers had been living there for thousands of years, and it must have been quite a shock to have these new people show up -- with a completely different lifestyle and appearance."