Answer;
The open door policy
Explanation;
Us secretary of state John Hay established the Open door policy which opened China's ports to European trade.
Open Door policy was a statement of principles initiated by the United States in 1899 and 1900 for the protection of equal privileges among countries trading with China and support of Chinese territorial and administrative integrity. John Hay, the secretary of state proposed this policy under president McKinley towards China for all countries.
One example would be economic opportunities. The possibility of a better job would pull someone to a new country. Hope that helps!
4/7s+6/7
all you do is distribute 2/7 to the expression 2s+3
A is the answer explantion