Why are the USA and Canada’s states border so straight?

Many states within the USA and Canada have straight lines as a border, completely ignoring natural borders like mountains or rivers. Many American states and Canadian provinces are just rectangle-shaped, and a good half of the US/Canada border is made of two straight lines (one vertical and one horizontal).

Why was it decided to make it like this? I understand the colonizers made arbitrary decisions initially, by why didn’t they pick more natural borders, for example following rivers and mountains?

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