Which city is located on the northern European plain

The North European plain covers northern Belgium, the Netherlands, Northern Germany Denmark and most of central Western Poland. Theres alot of city's you could chose from. An example could be Berlin which is in northern germany

c. troops marched forward in close formation against newer, more accurate weapons

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.