The east coast tends to have low pH or acidic soils. This is primarily due to the amount of rain that falls in that area and the fact that the soils are much older. The Midwest tends to have neutral soils because we get less rain and our soils are generally younger. The upper Midwest tends to have high pH or alkaline soils because the glaciers drop limestone till all over the place. The need for lime can occur locally anywhere. The best way to tell is to perform a soil test. Your local nursery probably sells pHydrion paper. This can be used to test the general pH of a soil. It will not be precise, but you can get a good idea of a soil's relative pH level.