The reason that made immigration different in the time between the year 1860 and 1920 that in previous years is that the immigrants are likely or tend to be more from the Southern and as well as the Eastern Europe that made it different compared before.
The Declaration of Independence was written to (c) explain why colonists were angry with British rule.
It was Wealth. A factor leading to a weakening of the US economy, was the unequal distribution of wealth(money).
Troops with assault riffles and tanks fired at demonstrators trying to block the military advance towards Tienanmen square.
Following proven health measures is still the best way to keep everyone, including children, safe from The Virus This includes keeping hands clean, practising sneezing and coughing into bent elbows, opening windows, wearing a mask if age-appropriate, and continuing physical distancing.