The best and most correct answer among the choices provided by your question are the second and fourth choices.
<span>Factors that contributed to the decline of the Roman Empire are the following:
</span><span>Rome could not grow enough food and maintain a large enough army to fend off barbarian tribes and; </span><span>Incompetent rulers placed huge tax burdens on the Roman citizens</span><span>
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American settlers moved to Texas because the Mexican government offered large tracts of free land to the settlers. In return the settlers had to obey the Mexican law.
