What helped the northern lowlands of the Maya succeed, even though the southern lowlands declined?

the answer is states.

i just did something on this guy a few days a go give me two minutes to find it in my notes.

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.