Stürzen vs. umstürzen
Both stürzen and umstürzen can be translated as to overthrow in English, but they differ significantly in what exactly is being overthrown. The distinction lies in whether the target is a specific individual in power or an entire political structure and system.
Stürzen
In a political context, stürzen means to remove a specific leader, monarch, or active government from power. It focuses on the act of making a person or a governing body fall from their current ruling position without necessarily changing the underlying system of the country.
Die Rebellen planen, den Diktator nach jahrelanger Unterdrückung zu stürzen.
(The rebels are planning to overthrow the dictator after years of oppression.)
Das Parlament hat den Präsidenten durch ein Misstrauensvotum gestürzt.
(The parliament overthrew the president through a vote of no confidence.)
Das hungernde Volk stürzte den König am Ende der langen Revolution.
(The starving people overthrew the king at the end of the long revolution.)
Ein überraschender Militärputsch stürzte die demokratisch gewählte Regierung.
(A surprising military coup overthrew the democratically elected government.)
Sie hoffen, den korrupten Herrscher bald friedlich stürzen zu können.
(They hope to be able to peacefully overthrow the corrupt ruler soon.)
Umstürzen
The word umstürzen refers to overthrowing or overturning an entire system, state, or structural order. It implies a much broader, fundamental upheaval of the status quo, aiming to completely dismantle existing societal or political structures rather than just unseating a single person.
Die radikalen Extremisten versuchten, den demokratischen Staat umzustürzen.
(The radical extremists tried to overthrow the democratic state.)
Ihr oberstes Ziel war es, die gesamte gesellschaftliche Ordnung umzustürzen.
(Their ultimate goal was to overthrow the entire social order.)
Die geheime Organisation plante, das herrschende kapitalistische System umzustürzen.
(The secret organization planned to overthrow the ruling capitalist system.)
Es ist historisch schwer, ein so fest etabliertes Regime einfach umzustürzen.
(It is historically difficult to simply overthrow such a firmly established regime.)
Mit roher Gewalt wollten die Aufständischen die alte Republik umstürzen.
(With brute force, the insurgents wanted to overthrow the old republic.)
Summary
In short, use stürzen when you are talking about removing a specific person, ruler, or active government cabinet from power. Choose umstürzen when you are describing the total overthrow, upheaval, or overturning of a broader political system, state, or societal order.