Dispensationlism: Arminian or Calvinist?

I have never really thought of it before, but it seems odd to me that the idea of premillenial dispensationalism is so much more popular with Arminians but not so much w/ Calvinists. Granted that there certainly are Calvinists who do hold to the premillenial dispensationalist view, as well as Arminians that do not. But in my experience I would be willing to bet money that an American Arminian is also a dispensationalist and that an American Calvinist is not. Perhaps this is incorrect, and if anyone has evidence to the contrary feel free to correct me.

In any case, this observance seems odd to me because the idea of premillenial dispensationalism, or at least the treatment of national Israel in that system, is simply an application of the five points of Calvinism applied to a nation instead of an individual.

For those unfamiliar with Calvinism, those five points are usually abbreviated as TULIP, and are as follows:

Total Depravity: Basically, this is the teaching that after the fall into sin, there is no inherent good in a person. The same could certainly be said of Abraham and his fleshly descendants. The history of Israel as detailed in the Bible certainly confirm that they were a depraved nation who constantly turned away from God, and God continually called them back. Without God's grace, there was no good in Israel.

Unconditional Election: This teaching states that God elects certain people to salvation without any condition that needs to be fulfilled on their part. The decision is completely up to God, and man has nothing to do with it. It goes without saying that dispensationalists see Israel as being unconditionally elected to be God's chosen people throughout eternity.

Limited Atonement: This teaching of Calvinism states that the atonement Jesus won was only won for the elect of God. Although dispensationalist do not state that Jesus atonement was only for Israel, they certainly state that Israel will receive certain blessings from God that are not for all of humanity in Christ. Dispensationalist hold a view of "Limited Favor" in which God has certain favors or blessings which are limited to Israel only. Even though speaking of different things, atonment vs. blessings or favor in genera, the concept is at least similar.

Irresistible Grace: The teaching that God's grace is effective on those whom he has elected, and that the elect are not capable of rejecting it. The dispensationalist believe that God's grace will be effective on the nation of Israel, and that the will not be able to reject that grace. They believe that "all Israel will be saved" and that they will not be able to reject that salvation, this is irresistable grace.

Perseverance Of The Saints: This teaching is basically "once saved always saved" with the condition that those who seemed to be saved but fell away were never really saved, or elect, to begin with. This too is applied to Israel by dispensationalists who stat that once Israel became God's chosen people, they will remain God's chosen people for eternity, they will persevere.

It is therefore interesting to me that the majority of those who believe in some form of dispensationalism are not Calvinists, but Arminians. Why is it that the very ideas which these people find to be absolutely repugnant in speaking of a person's relationship to God are completely accepted in speaking of a large group of people's relationship to God? Is there some sort of disconnect there, or am I misunderstanding something?

Alternatively, is there a disconnect here for calvinists who do not accept the teachings of dispensationalism?