Islam first started in Makkah (Saudi Arabia), and then spread to Madina. After that, Muslims would travel around the world (the entire world), and teach people about Islam, and what it's all about.
people were curious, it spread art and architecture to different places
This question needs a little history on the Muslims. Muslims have come from the Arabian parts of Asia. There many prophets were born and spread it across the land with many difficulties. It was some places like Palistine, Saudi Arabia, Madinah, Makkah and other places. Then after Muhammad (Peace be upon him) spread his part of Islam it spread through the Roman Empire all the way to Egypt so it is really hard to say exactly. Many Muslims are very peacefull like me. :-)
Yes they did... because they wanted to spread Islam to other regions and places. Another reason is they were being tormented by the non-believers of Mecca.
war
yes. it is part of the religion to spread its words to the people.
Muslims cannot eat pork in any place; it is forbidden for all places and all times.
There are three places of worship where Muslims should go: Makkah, Madina and Masjid Al Aqsa in Jerusulum
There has always been a competition between the Muslims and the Christian's. as in any religion their proof is based on Holy Books awarded by GOD and the way to spread it is by love and the the spread of harmony.
Islam is practised all over the world by Muslims.
There are millions of Muslims in America.
the muslims
Muslims don't worship any building. Even, the Kaaba (that is the most sacred Islamic building) is not worshiped by Muslims but respected and honored by Muslims. If you wish to read about places where Muslims worship (both houses of worship and sacred sites) read the Related Question below.