Explain the purpose of the marcher earldoms

Which two factors caused many americans to migrate to the west in the mid-nineteenth century? pick two the texas revolution discovery of gold at sutter’s mill the mexican-american war an interest in american indian culture cheap land prices

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

World war 2 was caused, in part, by which of these factors?