'assert' is correct and usable in written English. You can use 'assert' when you want to state a fact or opinion confidently or forcefully. For example, "She asserted that she had done the best job she possibly could.".
Uzbekistan is central Asia's most populous state and strives to assert itself as a regional power.
There was nonetheless a historical irony in watching Ukrainians tearing down Lenin's statues as a sign of their will to break with Soviet domination and assert their national sovereignty.
It is the aggressive attempt to export liberal permissiveness that causes fundamentalism to fight back vehemently and assert itself.
Lukashenko has toed a delicate line over the years, trying to assert his nation's independence of Russia while conscious of the power that Vladimir Putin holds over him.
The organisers of London 2012 frequently assert that this summer's Olympics will leave a legacy for our times to rival the Great Exhibition of 1851 or the Festival of Britain 100 years later.
Sachindra Narayan, a prominent Patna-based social scientist with the National Human Rights Commission in Delhi, said: "The prime reason [for the violence] is that [Dalits] feel empowered after seeing someone from their community at the head of the state and have begun to assert their rights.
The Napoli owner went on to assert that this was "either bad faith or incompetence" from the officials, demanding that all be punished for their errors.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.