There might be a link here
The decisive battle of Texas as the Battle of San Jacinto that lasted only 18 minutes. The Texan side was commanded by Sam Houston and while 9 Texans died, 630 Mexicans lost their lives.
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Depending on the time, it could be the Phoenicians ( I think this is the best answer; this is what they're known for best) or later in time, the Romans (but they had colonies also elsewhere).
Living in the city is dangerous because there are dangerous people in the city, and it is very poluted, but in the country, it is more remote and less poluted then the city, hope this helps