What is the main idea of the passage?
Terrorist groups often work alone to carry out
attacks.
Terrorist groups like al-Qaeda have been
neutralized by the United States.
Terrorist groups are disorganized but have
managed to launch successful attacks.
Terrorist groups pose a security threat to nations
throughout the world.

D.) Terrorist groups pose a security threat to nations throughout the world

Explanation:

I got it right

d.he wanted to send diplomats to communist countries.

the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.