Cockburn also states " straightforward invasions of another country have become less common " . During WW1 Germany and its allies invaded multiple cities , towns , and even countries . Now in more recent times countries cannot do this as easily as back in WW1 or WW2 . Now alliances , treaties and groups such as the United Nations keep theses things under control . At present times conflicts are not usually caused by countries invading each other they are now more centered around terrorism . There is a major debate about when you can and cannot defend yourself . The article " Principles of the Just War " state that " self-defense against an armed attack is always considered to be a just cause ." . This is a great point , an example of this is WW2 . The U.S. remained neutral , and the country was against going to war . After the Japanese attacked Pearl Harbor on December 7th , 1941 the country had its reason , the next day December 8th , 1941 the U.S. entered the second world war . Military also have R . E O 's (Rules of Engagement )
Cockburn also states " straightforward invasions of another country have become less common " . During WW1 Germany and its allies invaded multiple cities , towns , and even countries . Now in more recent times countries cannot do this as easily as back in WW1 or WW2 . Now alliances , treaties and groups such as the United Nations keep theses things under control . At present times conflicts are not usually caused by countries invading each other they are now more centered around terrorism . There is a major debate about when you can and cannot defend yourself . The article " Principles of the Just War " state that " self-defense against an armed attack is always considered to be a just cause ." . This is a great point , an example of this is WW2 . The U.S. remained neutral , and the country was against going to war . After the Japanese attacked Pearl Harbor on December 7th , 1941 the country had its reason , the next day December 8th , 1941 the U.S. entered the second world war . Military also have R . E O 's (Rules of Engagement )