Related by context. Frequent words. (Click for all words.) 54 transcontinental railroad 52 homesteading 51 westward 46 steamboats 46 Native Americans 46 Industrial Revolution 45 southward 45 immigrating 44 stagecoach 44 colonization 44 Manifest Destiny 44 Dust Bowl 43 settlers 43 migration 42 Gold Rush 42 emigrants 42 Appalachian Mountains 42 colonists 42 immigrants 42 emigration 42 Civil War 41 Civil Rights Movement 41 ancestors 41 assimilation 41 homesteaders 41 World War II 41 northward 40 hunter gatherers 39 slavery 39 Phoenicians 39 prehistory 39 Erie Canal 39 #th century 39 Underground Railroad 39 eastward 39 frontier 39 freed slaves 39 twentieth century 38 Pony Express 38 nineteenth century 38 descendants 38 depopulation 38 industrialization 38 steamboat 38 migrations 38 interracial marriages 38 Protestant Reformation 38 runaway slaves 38 railroads 37 Great Depression 37 interstate highway 37 railroad 37 women suffrage 37 emigrating 37 descendents 37 midcentury 37 Polynesians 37 manifest destiny 37 exodus 37 prairies 37 natives 37 Revolutionary War 37 gentrification 37 migrants 37 civilization 36 War I. 36 Harlem Renaissance 36 Great Recession 36 suburban sprawl 36 abolitionists 36 homesteaded 36 upriver 36 Roman Empire 36 rapid industrialization 36 slaves 36 secularization 36 forebears 36 steamship 36 colonizing 36 pioneers 36 immigrated 36 railroad tracks 36 plains 35 Appalachians 35 acculturation 35 portage 35 renaissance 35 prospectors 35 Normandy invasion 35 beginnings 35 pogroms 35 enslavement 35 Depression 35 eighteenth century 35 emigrate 35 Confederates 35 explorers 35 intermarriage 35 immigrate 34 Mississippi River 34 #s [002]