TIMES PLEASE HURRY. The map shows railroads of the North and South in 1850 and 1861. A map showing the railroads of the North and South in 1850 and 1861 in the U S.
What was the most significant effect of the growing railroad system?

The South grew wealthier than the North.
Railroads stimulated economic development.
The North transported more goods through shipping.
Entrepreneurs stopped investing in roads and canals.