Answer: a Steam Locomotive.
<h2>What is a Steam Locomotive?</h2>
"<em>A steam locomotive is a type of railway locomotive that produces its pulling power through a steam engine."</em>
<h2>What is the Tom Thumb?</h2>
"<em>Tom Thumb was the first American-built steam locomotive to operate on a common-carrier railroad."</em>
-Edge
The end of the Peloponnesian War was when the 421 Truce treaty signed

The answer is...
B. Northeast
Hopefully, this helps you!!

A difficulty voting hope that helps