How did railroad expansion make natural resources more available in the us? by increasing the amount of natural resource deposits by making it possible for natural resources to be transported to different cities and towns by using natural resources to build tracks and train equipment by transporting people to cities and towns where they could purchase natural resources

The correct answer is by making it possible for natural resources to be transported to different cities and towns 

For example, oranges only grow in warm climates, so in the older times it would be almost impossible to find oranges in places like Minnesota since the long journey from places like California would destroy them before they reached Minnesota. With the railroad, the journey was made possible and now all over the US you could find goods from other parts of the US which wasn't possible before.

Railroad expansion made natural resources more available in the US by "making it possible for natural resources to be transported to different cities and towns" since before the railroad this transportation took a long time and was far more costly.

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