It is true that as a result of the siege of Boston, the British abandoned the city. After eleven months of the siege, the British abandoned Boston and sailed to Nova Scotia.
The correct answer is D.
Many of the European countries involved in the era of imperialism had a large standing army. Countries like Great Britain and France had been around for centuries and built a strong military. The other three are all important factors that lead to the increase of imperialism in the 1800's.
The period from 1920-29 is often called the 'Roaring Twenties' because it was a time of noise, lively action and economic<span> prosperity. The First World War had been good for American business.</span>