Which powers are solely at the state level? expressed implied concurrent reserved

The correct answer is reserved powers.

Any power that is not specifically given to the federal government nor explicitly denied to the states, belongs to the states. This idea is part of the US Constitution and ensures that state governments have some control over issues relating to the citizens of their state. This was originally implemented in the Constitution as a means to ensure that the federal government does not become too large in size/scope.

in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.