Why do many historians regard the printing press as the most important invention of the past millennium? Please give at least two sentences.

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Explanation:

The printing presss (invented by Gutenberg) made it easier to publish books, which increased the education level of the world and made transfer of knowledge streamlined, which was beneficial to the intellectual community. Now, findings could be published and reviewed by other scholars. Before the printing press, all texts had to be handwritten and then painstakingly copied by monks or scribes. Additionally, religious texts like the Bible were now more readily available, and missionaries used this to their advantage; conversion rates went up as religious enlightenment was aided by the availableness of the Bible or the Quran.

four sitting presidents have been assassinated while in office but the first was abraham lincoln,

the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.