Why were all white men given the right to vote in the new territories?

To get settlers in the territory is the right answer.

Explanation:

In order to get more immigrants, the administration used its one of the most powerful tactics of manhood suffrage. The government granted suffrage to all white men either they had land or not. Apart from this, the administration also set up the prices of the land at very low so that the settlers could easily buy large tracts of land at low prices. Hence, to encourage people to move and settle, the administration even awarded voting rights to those who had no land.

that is because lower interest rates allowed people to work harder to make money. it multiplied like that and now the uno(not the game) is very strong.

i like trains

your answer is

to dominate europe

and i know for a fact it can't be the others