Same as every where else, trains and boats and planes and buses and cars and motorbikes and cycles - or you could walk
Yes, Poland is a part of the EU.
If you travel from the US to Poland, you would pass no Eastern European nations, as Poland is one the westernmost Eastern European nations. You would travel across the Atlantic Ocean, most likely through countries such as France and Germany, and then arrive in Poland.
yes
For the EU citizen, to travel inside EU (like from Ireland to Poland) a valid ID is required, but not necessary a passport.
Yes, Poland is part of the Schengen Area and Schengen visas are valid.
Yes, Poland is part of the Schengen Area and Schengen visas are valid.
Seattle to Poland is about twice as far as Seattle to Florida.
The German army travelled to Poland in tanks, armoured cars, trucks, motorcycles, horses and on foot.
There are several websites where an individual could search hotels in Poland. Examples would include Stay Poland, Trip Advisor, Pol Hotels, Hotels, and Travel Poland.
Tricity is a region in Poland. Information on this region can be obtained from Poland Travel, Poland For Visitors, Wikipedia, Love Warsaw and YouTube.
you would have to go west
they were moved by the Nazis, not from the Nazis, the Nazis were in Poland. Most long distance travel was made by train.