Answer:
Serving until his death in May 1964, Nehru remains India's longest-serving prime minister. He was succeeded by fellow Congressman Lal Bahadur Shastri, whose 1 year 7-month term also ended in death.
A sister group or sister taxon is a phylogenetic term denoting the closest relatives of another given unit in an evolutionary tree.
The answer to the question about why would nationalism lead to intolerance and persecution of other ethnic or national groups is explained below.
Explanation:
When a nation promotes its own interests, over the interests of other nations, it is called as nationalism. Nationalism creates a feeling of inferiority within the minorities of a country, which may lead to intolerance among them.
Countries usually contain diverse group of people, who are from different backgrounds, ethnicity, etc. Large group of people in a country or region creates pride among them of their sharing of common heritage, history, backgrounds, ethnicity, etc. This thing may leave many minorities alone and make them feel inferior in the same region or country, which would no doubt lead to intolerance among them.
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The main reason why United States was involved in Vietnam is that the United States believed in the so called Domino effect: that if one country becomes communist, others might become communist too. So they got involved to stop the spread of communism (option a)
