Ключевые слова: america, american, background, banner, builder, business, celebration, concept, construction, day, design, engineer, equipment, flag, freedom, greeting, hammer, happy, helmet, holiday, industrial, industry, international, job, labor, labor day, labour, may, men at work, national, object, occupation, patriotic, safety, state, symbol, tool, united, usa, work, worker, wrench, yellow,