When we see that our forefathers served other Gods and sinned against the Most High. Its always in our best interest to find out what those other Gods are. Also, be careful who you "pledge your allegiance to." Some nations God hates because they have looted, murdered, and wrongfully imprisoned his chosen people. Make sure when pledging your allegiance that you trust the leaders enough to know they are clean in the eyes of the Lord.
I used to say, "But that's not what it means to me. God sees my heart" Now I say, "The Bible says that the heart is deceitful above all things. I now care more about what the Almighty YHVH says and thinks than what man does."