The main way in which America's policy changed from isolationist to more active involvement in the world was though the Spanish American War and the Open Door Policy.
The Great Wall of China( built and maintained from the warring state period to the Ming dynasty)
<span>When compared to the 1990s, views regarding gay and lesbian marriage are becoming increasingly divided between positive and negative. Civil unions have legally recognized unions of gay and lesbian couples that are intended to offer legal rights and benefits that are available to heterosexual couples.</span>