Answer:
I think Terrorism has been a challenge for the US because there have been some serious attacks that left many people dead.
An imperial complex of religious buildings situated in the southeastern part of central Beijing. The complex was visited by the Emperors of the Ming and Qing dynasties for annual ceremonies of prayer to Heaven for a good harvest.
Effects of Imperialism - Imperialism is when a mother country takes over a smaller nation or colony for political, social, and/or economic reasons. ... This major Imperialism occurred during the late 19th Century and early 20th century. It had more negativeeffects in the modern world today thenpositive effects.