In the Old Testament you will find special blessings for Israel; but even then, God did not bless only Israel. He promised Abraham that "in your offspring shall all the nations of the earth be blessed" (Genesis 22:18).
Once we look to the New Testament, we have Jesus commanding His disciples to preach His gospel throughout the world (Matthew 28:18-20, Mark 16:15*, Luke 24:46-49, Acts 1:8).
Paul said that in Christ:
Or is God the God of Jews only? Is he not the God of Gentiles also? Yes, of Gentiles also, since God is one—who will justify the circumcised [the Jews] by faith and the uncircumcised [the Gentiles] through faith. (Romans 3:29-30)
There is neither Jew nor Greek, there is neither slave nor free, there is no male and female, for you are all one in Christ Jesus. And if you are Christ's, then you are Abraham's offspring, heirs according to promise. (Galatians 3:28-29)
God is not the God of America only, or the God of Israel only -- He is the God over all the world and wishes to draw every person from every nation to Himself (John 3:16-17, 12:32).
And they sang a new song, saying, "Worthy are you to take the scroll and to open its seals, for you were slain, and by your blood you ransomed people for God from every tribe and language and people and nation, and you have made them a kingdom and priests to our God, and they shall reign on the earth." (Revelation 5:9-10, emphasis mine)
* Early manuscripts do not include verses past 16:8