Since these cities are close by and therefore, the sequences might belong to individuals that have been diverged relatively recently. Hence, there have not been much accumulation of mutations. Therefore, the sequences are closely related, resulting in clustering together in the phylogram.
If the individuals had diverged long ago, they should have been migrated to far away places and in the mean time, should have accumulated more mutations than otherwise.
His autobiographical novel The Son of a Servant, Strindberg describes a childhood affected .... society, it has frequently been described as the first modern Swedish novel.
In general yes, the states honored their agreement since the Articles of Confederation demanded practically nothing from the states--meaning that it wasn't hard for the states to uphold their end of the bargain.