[PaulHoule]

Britain lurched to the right after Margaret Thatcher but that didn't keep Labor from being in power for a few years (by co-opting the Tory program the same way Clinton co-opted Reagan) Germany, Israel, France, and numerous countries with parliamentary systems have power alternate between parties.

As for "opposition to conservatives everywhere is often much more fractured" that makes me think of an observation I've had which is that conservatives in the US are united by the idea that there is a way that things are "spozed" to be whereas what passes for the left in the US are a groups of people who perceive themselves to either be outgroups or be supportive of outgroups. The problem is that racial/ethnic groups such as blacks or latinos don't automatically support, say, transsexual maximalism. Environmentalism is still perceived as a "white thing" even though blacks are worse off when it comes to exposure to toxics. "Environmental racism" as an issue just hasn't sold.