Ключевые слова: america, american, celebrate, celebration, concept, construction, country, day, democracy, design, engineer, event, festival, freedom, government, greeting, ground, helmet, holiday, independence, industrial, industry, international, job, labor, labor day, labour, lifestyle, message, nation, national, patriot, patriotic, patriotism, pride, safety, safety helmet, sign, state, symbol, symbolic, united, us, usa, work, worker,