They were made of mud brick.
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The evidence of the Olmec civilization’s advanced agricultural system are:
Irrigation growing crops: Olmec civilization implemented irrigation systems in the coastal areas of the Gulf of Mexico in order to grow crops such as beans and corn.
Food surpluses: As they harvested the land twice a year, they generated food surpluses for the community. At the same time, food surpluses was possible due to the collection of plant food, sea food, among others.
Permanent settlements: Olmec civilization had permanents settlements with three main sities: San Lorenzo, La Venta and Laguna Los Cerros.
The main reason conflict has broken out in Northern Ireland is because of its unification issues. There was a divide between unionists, usually people who wanted to remain within the United Kingdom and were protestants and the nationalists who wanted to unify with the Republic of Ireland and were Catholics. There was constant tension as it was said the unionists mistreated the nationalists and violence soon broke out. Although the Northern Ireland conflict is technically supposed to be finished, sporadic violence still breaks out.
Answer:
Lithuania, Latvia, Poland, CZECHOSLOVAKIA, Austria, Hungary, Yugoslavia. Are the newly formed countries
