Nationalism is an ideology which affects social, political and economic political systems. It is based on the protection of sovereignty of the country and maintaining a national identity free of foreign intervention. It defends and promotes national interest over foreign relations.
Imperialism is an ideology or practice that promotes expansion and dominion over other countries, aquiring new territories and colonies, and exercising control over them.
For example, during World War II, the Japanese government promoted a nationalistic ideology amongst the people to create unity against foreign invasion and colonization. Fear was used to generate nationalism, because they acted in response to foreign threats. Nationalism affects Imperialism because it reinforces the idea of one country being better than the other. Fear of external intervention leads to the idea the "offence is the best defense": in order to protect our nation, we have to expand our territory. It can be said that nationalism becomes an excuse for imperialism.
Here’s a list to some of the main causes
1. Poverty: the state of being poor. The most hungry people in the world are the ones that live in extreme poverty. Those mostly are smallholder farmers in developing countries.
2. Job instability: when someone lacks a job or is paid to little to live comfortably they may be facing hunger. They may not have enough money to eat so they only pay for what they have to instead of food for themselves. For example, a single parent paying rent and food for their kid but doesn’t have enough for themselves.
3. Lack of access to safe water: Without access to safe water, crops can’t grow properly, and people can’t survive or stay healthy.
4. Food shortages or scarce availability of food: Food from the previous harvest runs out and families cut back on meals. The more they run out the less they eat.
Http://www.biography.com/people/thurgood-marshall-9400241
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The Middle Ages was a time of extreme religious devotion and only one religion was accepted in Europe: Christianity, and also only one church was considered proper: the Roman Catholic Church. A heretic would be anyone who would challenge in any way anything that the church was saying. (even that the Earth rotates around the Sun).