Why dont we Americans create jobs ourselves and become a collective society?

What i mean by this is why become isolated and just rely on corporations/govt to create jobs? Thats how we "americanized" americans have become. I look at new comers to america and am impressed. They pick a city make it into a "little russia" or "little china" and stick together. They gather all their resources and stick together and have their little community economy. They Open brokerages, mechanic shops, pastries... everybody knows everybody mentality..Does this make sense?