Which of the following political changes was most instrumental in causing the demographic changes shown in the chart? O Increase in large-scale regional conflicts

O Liberalization of laws surrounding migrant labor

O Creation of pension plans and other forms of social insurance

O Shift of focus from producing cash crops to achieving food security

answer; i believe that the correct answer is (chronological order);

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.

) the chinese armed forces had been removed from the city