Calling the U.S. ‘peaceful and benevolent’ overlooks the sheer volume, aims and consequences of its military actions. It may not colonize in the traditional sense but its interventions often reshape nations in the US' favour, often violently, without accountability and leaving the populace of those countries much worse off than before.
I think it's not wise to judge present day against history as we should be aiming for improvement over time but if we look at recent history the US has a history of destabilising governments, often democracies, in favour of a more US aligned government. Often these efforts fail and the country descends into chaos. In others it leads to a government that uses death squads to help US businesses (see the banana republics).
Russia's aims in Ukraine were mostly likely to install a Russian aligned leader. This is similar to the USA's history of installing or supporting anti-democratic leaders. So whilst the US might not be absorbing countries but that shouldn't be the only metric for control.
Canada’s involvement in Afghanistan was under UN mandates and I agree that peace keeping forces are often good but that is not comparable to US military interventions. The US often acts unilaterally, or with limited partners and lack of widespread support.
With 251 military interventions since 1991 [1] we can cherry pick the best and worse uses of force, and I agree that sometimes force is needed, but I see the long term trend that the intention is indeed to help but it is mostly to help US interests. Consider as well that colonial Britain (and other colonial powers) also thought they were being helpful and bettering their colonies by bring "civilisation". Just because you think or state your aims are good doesn't make them so.
I'd argue that whilst the US could definitely not take over the world militarily (see how often it fails to take over a country) it already has in large part due to trade and culture and this is why it fears China so much, as China is now a rival for that power.
[1] https://towardfreedom.org/story/archives/americas/u-s-launch...