That is too absolute a statement. But generally, yes, I believe that a militarily strong US that has an interest in global trade makes war much less likely.
Of course, one of the inherent problems of having a strong military is the temptation to use it - and the US has certainly done so multiple times in ill-advised fashion in Irak, Kuwait or Vietnam to name just a few.
But having a military superpower like the US that's more interested in economic and cultural expansion than in direct land grabs is certainly an important counterweight to Russian or Chinese ambition. I believe a world with a militarily weak US would have seen much less "Pax Americana" and much more aggressive, expansionary wars since 1945.
Of course, one of the inherent problems of having a strong military is the temptation to use it - and the US has certainly done so multiple times in ill-advised fashion in Irak, Kuwait or Vietnam to name just a few.
But having a military superpower like the US that's more interested in economic and cultural expansion than in direct land grabs is certainly an important counterweight to Russian or Chinese ambition. I believe a world with a militarily weak US would have seen much less "Pax Americana" and much more aggressive, expansionary wars since 1945.