What is the main role of the North Atlantic Treaty Organization (NATO)? O to strengthen member nations' military response to possible invasion
O to create a common market for the easy flow of goods and services across borders
O to provide humanitarian relief to people suffering from natural disasters
O to make it easier for developing nations to train and maintain an army

NATO's essential and enduring purpose is to safeguard the freedom and security of all its members by political and military means. Collective defence is at the heart of the Alliance and creates a spirit of solidarity and cohesion among its members.

Explanation:

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on this day in 1833, president andrew jackson announces that the government will no longer use the second bank of the united states, the country's national bank. a national bank had first been created by george washington and alexander hamilton in 1791 to serve as a central repository for federal fund