Boundaries History 22 Politics and government 13 Social aspects 12 Emigration and immigration 10 Social conditions 9 Territory, National 9 Foreign relations 8 Geopolitics 8 Borderlands 7 Government policy 6 Political aspects 6 Ethnicity 5 Globalization 5 Nationalism 5 Border security 4 Economic conditions 3 Immigrants 3 Imperialism 3 Nation-state 3 Political geography 3 Relations 3 Walls 3 Berlin Wall, Berlin, Germany, 1961-1989 2 Border patrols 2 Boundaries in art 2 Case studies 2 Cold War 2 Cultural assimilation 2 Diplomatic and consular service, Irish 2