Many people believe that all of their ancestors originally came from one particular country. Even though they may be 100% correct about some of their ancestors, they are unaware of the bigger picture.
When viewed within a 2,000 year time frame, it appears impossible to have ancestors from Ireland and not have ancestors from Italy, or to have ancestors from Scotland and not have ancestors from Turkey, or to have ancestors from Portugal and not have ancestors from Russia, etc.
For instance look back just 1,000 years to the family of Jaroslaw I Vlasimirowitsch, Grand Duke of Kiev. In 1009 he married Ingegard of Sweden. Without looking further back, we at least know that all nine or so of his children have both Russian and Swedish ancestry.
Within just a couple of centuries, his six sons had descendants scattered throughout all points of Europe, and probably well into Asia. But let’s look at just the three daughters.
One daughter married Andreas I, King of Hungaria. Their daughter married a king of Bohemia, and had children. So in just a few generations their children have at least Russian, Swedish, Hungarian, and Bohemian ancestry.
Another daughter married Harald Hardrada, King of Norway. Before 1400, she had descendants in Alencon, Anhalt, Aragon, Athens, Austria, Bar, Bavaria, Bohemia, Bourbon, Brabant, Brandenburg, Brittany, Brunswick, Burgundy, Calabria, Castile, Constantinople, Cracow, Cyprus, Denmark, Durazzo, England, Estonia, Exorica, Flanders, France, Galacia, Gandia, Germany, Gravina, Grubenhagen, Hainault, Hapsburg, Hessen, Holland, Holstein, Homberg, Hungary, Ingolstadt, Kalisz, Lorraine, Luxemburg, Majorca, Mecklenburg, Molina, Moncada, Monferrat, Monthemer, Morea, Naples, Narbonne, Nassau, Navarre, Norway, Novgorod, Orleans, Palatine of Rhine, Perche, Perigord, Poland, Pommern, Poznan, Provence, Ribagorza, Rugen, Russia, St. Pol, Savoy, Saxony, Schleswig, Scotland, Serbia, Sicily, Slavonia, Sweden, Taranto, Thessalonica, Toledo, Tortosa, Toulouse, Urgel, Valencia, Valois, Vienna, Waldeck, Wroclaw, and many other places.
But by comparison, a much larger high-probability intersection was created by the other sister. She married Henri I, King of France. The probability of passing through this one intersection multiple times if you follow your ancestral trails long enough must be amazingly close to 100%.
As a rule of thumb, it’s usually true that kings begat kings. But quite often, it’s equally true that kings begat many other children, who begat many other children, who begat many other children, etc. The royal genes spread profusely throughout the general populations of many countries within several centuries.
At the time the small number of Mayflower families began creating their estimated 30,000,000 descendants living today, how many families throughout Europe were creating descendants of Russian couple Jaroslaw I Vlasimirowitsch, Grand Duke of Kiev, and Ingegard of Sweden? Tens of Thousands? Hundreds of Thousands? More?
While traveling along all of your own ancestral trails that will lead you back to Jaroslaw I Vlasimirowitsch, Grand Duke of Kiev, and Ingegard of Sweden, it seems inevitable that you will pass through every country in Europe.