To give you an idea how borders can change within one country within 150 years, here's a map of Germany with borders as of 150 years ago (1856).
The red-marked border is those of the Deutscher Bund or German Confederation (a merely diplomatic assembly of rulers or their representatives, created after 1815 as kind of successor to the Holy Roman Empire of German Nation), the black border is that since 1990:
.... and all those tiny and tiniest lines inside mark the borders of independent states resp. their land!