Based on the information on the map, what can you infer about industry in the united states?   (1  point) • manufacturing was a key part of the economy in the northeast. • agriculture was the major industry in the south. • mills in the northeast had to be close to ports to make it easier to transport factory-made goods. • population levels in the midwest made it difficult to support the amount of labor required to industrialize. based on this image, how can you tell the spinning jenny increased the speed of thread production?   (1  point) • it is built so only one person needs to spin its single wheel. • it is built out of metal to ensure it lasts a long time. • it is built to spin multiple spools of thread at one time. • it is built with a steam engine to power the spinning wheel. 3.    which of the following statements best summarizes the system of railroads shown on the map?   (1  point) w the majority of the railroads that connected the north to the south were built by 1850. w the railroads established by 1860 each began and ended at a major american city or port. w the primary direction of the railroads built between 1850 and 1860 was north to south. w the extent of the railroads in the south was very limited compared to that of the north.