Growing overseas trade, economic prosperity, and a climate for progress affected<span> the working class.
</span>Cities grew speedily<span>, </span>therefore there have been<span> no development plans, </span>healthful<span> codes, or building codes. It </span>cause<span> inadequate housing, education and </span>enforcement<span>. Garbage </span>heaped within the<span> streets. F</span>olks<span> lived in </span>shut<span> quarters and caused diseases to </span>unfold faster<span>. T</span>he typical lifetime<span> in urban areas was </span>seventeen<span> (38 in rural areas).</span>
<span>This is of course somewhat of a subjective question, but in general most would agree that in general expansion was not justifiable since the Mexicans and Natives were doing nothing to provoke the US. One could argue it was justifiable since Americans needed more land. </span>
Thr lack of a complete skeloton sence they could only find the remains which may have been not enough for them to learn about early hominids:)
