IN: The Tlingit language (English: , ; Tlingit: Lingit [linkit]) is spoken by the Tlingit people of Southeast Alaska and Western Canada. It is a branch of the Na-Dene language family. Extensive effort is being put into revitalization programs in Southeast Alaska to revive and preserve the Tlingit language and culture. Missionaries of the Russian Orthodox Church were the first to develop a written version of Tlingit, using the Cyrillic script to record and translate it, when the Russian Empire had contact with Alaska and the coast of North America down to Sonoma County, California.

Tlingit has a complex system of pronominals, which vary depending on their relationship to the verb. The subject pronominals are incorporated into the verb in its subject slot. The object pronominals are also technically incorporated into the verb (i.e. the verb "complex"), but most are graphically independent. They are divided into three classes, the verbal object, nominal object, and postpositional object. There are also the independent pronominals which are completely separate from the verb and can be used in dependent clauses or in subject or object position. The pronominals all have related semantic values, and their organization can hence easily be visualized in a table. The numbers in the first column represent the usual concept of person, i.e. first, second, or third. Story and Naish identified a fourth person, but this term is inappropriate since they did not describe a clear separation between the so-called fourth person and the other impersonal pronominals. When analyzing a sentence, the pronominal type is given first, then the form (subject, object, independent) is given following a period. This uniquely represents the pronominal as a two dimensional unit. Thus 1SINGULAR SUBJECT is the first person singular subject pronominal, realized as xhat. The RECIPROCAL does not uniquely identify one of the two reciprocal pronominals, but since they are both phonetically identical as woosh, it is generally unnecessary to uniquely identify them. There is also a notional zeroth person which can be of subject, object, or independent form. This is not realized in Tlingit, instead it is an empty placeholder for analysis.

What is the 1st class?

OUT: first column represent the usual concept of person,

input: The Mississippi stage is usually divided into three or more chronological periods. Each period is an arbitrary historical distinction varying regionally. At a particular site, each period may be considered to begin earlier or later, depending on the speed of adoption or development of given Mississippian traits. The "Mississippi period" should not be confused with the "Mississippian culture". The Mississippi period is the chronological stage, while Mississippian culture refers to the cultural similarities that characterize this society. The Early Mississippi period (c. 1000-1200 CE) had just transitioned from the Late Woodland period way of life (500-1000). Different groups abandoned tribal lifeways for increasing complexity, sedentism, centralization, and agriculture. Production of surplus corn and attractions of the regional chiefdoms led to rapid population concentrations in major centers. The Middle Mississippi period (c. 1200-1400) is the apex of the Mississippi era. The expansion of the great metropolis and ceremonial complex at Cahokia (in present-day Illinois), the formation of other complex chiefdoms, and the spread and development of SECC art and symbolism are characteristic changes of this period. The Mississippian traits listed above came to be widespread throughout the region. The Late Mississippi period (c. 1400-1540) is characterized by increasing warfare, political turmoil, and population movement. The population of Cahokia dispersed early in this period (1350-1400), perhaps migrating to other rising political centers. More defensive structures are often seen at sites, and sometimes a decline in mound-building and large scale, public ceremonialism. Although some areas continued an essentially Middle Mississippian culture until the first significant contact with Europeans, the population of most areas had dispersed or were experiencing severe social stress by 1500. Along with the contemporaneous Ancestral Pueblo peoples, these cultural collapses coincide with the global climate change of the Little Ice Age. Scholars theorize drought and the reduction of maize agriculture, together with possible deforestation and overhunting by the concentrated populations, forced them to move away from major sites. This period ended with European contact in the 16th century.

Answer this question "to what, though?"
output:
The Middle Mississippi period (c. 1200-1400) is the apex of the Mississippi era.