Ключевые слова: america, american, background, celebrate, celebration, commercial, construction, coronavirus, covid19, date, democracy, design, employers, employment, engineer, equipment, festival, flag, freedom, greeting, happy, helmet, holiday, independence, industrial, industry, international, job, labor, labor day, labour, liberty, may, memorial, nation, national, occupation, patriotic, patriotism, profession, september, sign, star, states, united, united states, usa, work, worker, workers,