<span>Supremacy Clause
</span>the US Constitution and federal laws and treaties made in accordance with the Constitution are the <span>supreme law of the land.
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B the US has an extremely extensive railroad system not Europe
I live in Texas and because of that is that New Mexico and Texas once shared the Pecos river but New Mexico decided to build a dam and hardly let a little flow so that's why Texas doesn't have that many natural rivers or lakes and plus there is more than one natural lake in Texas
The answer to your question would be B